Ivory-billed Woodcreeper

The ivory-billed woodcreeper is 20 to 26.5 cm (7.9 to 10 in) long. Males weigh 40 to 62 g (1.4 to 2.2 oz) and females 35 to 56 g (1.2 to 2.0 oz). It is a medium-sized member of genus Xiphorhynchus, with a long, fairly heavy, slightly decurved bill. The sexes have the same plumage. Adults of the nominate subspecies X. f. flavigaster have a face with fine buffy and blackish streaks, an indistinct buffy supercilium and eyering, and a faint dark stripe behind the eye. Their crown and nape are dark grayish brown with longish buff spots that are almost streaks. Voice: The ivory-billed woodcreeper's song in western Mexico is "piercing whistles in loud cascade that first ascends slightly and increases in volume before descending and slowing, 't-t-t-ttttttttt-t-tewtewtew-tew-tew' ". In northern Central America it is "a rapid trill, descending slightly in pitch at end" and in Costa Rica "a loud, laughing, descending whinny.